What's funny is that I get the same thing with Japanese, which is why I don't bother using it here in the city anymore. I'm pretty fluent, and when I try and initiate with a Japanese person in Japanese at a bookstore, restaurant, etc, they just flat out refuse to speak to me in the language. I guess they came to this country to learn and improve their English, and not let some white guy try and impress his friends.
I had a good buddy at the time, he was a red headed Irish kid from Brooklyn that was stationed in Tokyo during his time in the service. He was tatt'ed up the wazoo (Japanesse tats that aren't visable in a business shirt), he was a hot shot cold caller at a small chop shop we worked at back in 1997. The story goes he befriended a bunch of low level Yakuza dudes, they loved him, he was funny, could drink like a fish and was absolutely nuts. He said, they never let him within a million miles of anything nefarious other than drinking/carousing, I do not think he was lying his stories added up.
Anyhow during a lunch break in downtown Fort Lauderdale, (we had no idea at the time he knew Japanese or any of the above). This knockout Japanese girl was walking down the street. He said, "watch this", walked up to her and said something in Japanese. The broad turned beet red, it was awesome. She wrote down her # on his business card, they talked for a few moments and he came back laughing. He wound up dating her for a bit till he found something else.
I am sure you did well in Japan with the broads if you were fluent in Japanese.
I have no idea why I just typed that nonsense, I guess I am bored.